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The "moving wall" represents the time period between the last issue
available in JSTOR and the most recently published issue of a journal.
Moving walls are generally represented in years. In rare instances, a
publisher has elected to have a "zero" moving wall, so their current
issues are available in JSTOR shortly after publication.
Note: In calculating the moving wall, the current year is not counted.
For example, if the current year is 2008 and a journal has a 5 year
moving wall, articles from the year 2002 are available.

Terms Related to the Moving Wall

Fixed walls: Journals with no new volumes being added to the archive.

Absorbed: Journals that are combined with another title.

Complete: Journals that are no longer published or that have been
combined with another title.

Abstract

1. Cockscomb (Celosia argentea var. cristata), C. argentea, an almost sterile hybrid between them, and eight F2 plants raised from seed from the hybrid have been studied cytologically. The hybrid possessed a chromosome number (2n = 54) intermediate between those of the parents (2n = 36 and 72 for cockscomb and C. argentea, respectively). The parents exhibited typical meiotic pairing, and no irregularities were observed. A cross between these species has been previously reported by Wakakuwa (21), who described the meiotic behavior of the hybrid. Of the eight F2 plants investigated in this study, somatic chromosome numbers of 54 (three plants), 81 (one plant), and 108 (four plants) were observed. Atypical meiotic behavior was found in all F2 plants. 2. Aberrations in microsporogenesis resulted in many types of microspores. An estimate of the percentage fertility of all plants is given. 3. Both stomatal and pollen-grain size were proportional to chromosome number and were found to be valuable criteria for distinguishing the polyploid plants in Celosia. 4. Twenty-six different types of fasciated cockscombs showed no difference in chromosome number. Fasciation in cockscomb must result from genic rather than from chromosome number differences. 5. Cockscomb is considered to have been incorrectly made a variety of C. argentea and should be reinstated as C. cristata L. 6. As a result of fasciations of the inflorescence, there is probably an insufficient number of flowers producing seed for cockscomb to maintain itself in nature.